I agree, but they are failing to order scans when the probability of finding anything worth biopsying is low because of cost.

This is so obvious it's crazy, our entire world view is misshaped around saving money.

When you walk into a doctor's office, why do they take your blood pressure and temperature? Why do they look at the back of your throat and listen to you breath?

These are all diagnostic procedures with extremely high false positive rates. The reason doctors do these but do not do MRIs is because MRIs are expensive.

If MRIs were free you would get one automatically every time you go to the doctor.

No, you still wouldn't, because doctors are neither free nor perfectly rational.

The probability of finding something worth a biopsy is not low, it is high compared to the probability of the patient requiring intervention.

Yes that is my point. It's about cost

That's not what they said.